n.[C]

1. 碼尺（一碼長的尺）
2. 衡量標準，評價標準[（+of/for/against）]
   Do you think the TOEFL score is a good yardstick for English proficiency?

   你認為托福成績是一種衡量英語流利程度的好標準嗎？

   She was a yardstick against which I could measure my achievements.

   她是一個我可以用來衡量我的成就的準繩。

n.

1. a measuring rod a yard long.
2. a standard used for comparison.